CN112958851B - Cutting tool with pretension spring and method of assembling the same - Google Patents
Cutting tool with pretension spring and method of assembling the same Download PDFInfo
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- CN112958851B CN112958851B CN202110297570.1A CN202110297570A CN112958851B CN 112958851 B CN112958851 B CN 112958851B CN 202110297570 A CN202110297570 A CN 202110297570A CN 112958851 B CN112958851 B CN 112958851B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 3
- 230000009471 action Effects 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 description 8
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- 238000012986 modification Methods 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F21/00—Tools specially adapted for use in machines for manufacturing gear teeth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
- B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
- B23F23/1206—Tool mountings
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Abstract
The invention discloses a cutting tool with a pre-tightening spring and an assembling method thereof, the cutting tool comprises a tool body, a tool groove is arranged on the tool body, a threaded through hole is formed between the outer edge of the tool body and each tool groove, a locking screw is arranged in the threaded through hole, a pressing block is arranged between the locking screw and a blade, a spring groove is formed in the inner side surface of the pressing block, the pre-tightening spring is arranged in the spring groove, the pre-tightening spring is provided with a pressing part which is contacted with the pressed surface of the blade in a smooth transition mode in the inserting and withdrawing directions, and in the pre-tightening state, the pressing part of the pre-tightening spring is higher than the inner side surface of the pressing block and is contacted with the pressed surface of the blade. The cutting tool can realize that the blade can enter a pre-tightening state after being inserted into the cutter groove during tool assembly, the blade can be continuously and smoothly inserted into and withdrawn from the cutter groove, the adjustment is easy, in addition, the parts are fewer, and the cutter bar can be ensured to be in a reasonable stress state.
Description
Technical Field
The invention relates to the technical field of gear cutters, in particular to a cutter bar type assembled cutter for cutting and processing gears. The invention also relates to a method of assembling the tool.
Background
Gear cutting tools are rotated substantially about a tool axis during cutting and can be simply divided into unitary tools and assembled tools. Assembled tools typically have a tool body with one or more pockets arranged to receive a knife bar blade, each blade positioned in a pocket and locked therein with one or more locking screws and compacts.
The assembled blade type cutter requires that the assembled blade cutting edge with the same name is also regulated and controlled within a certain tolerance range in the radial direction and the axial direction on the basis of sharpening precision of the blade cutting edge within a certain tolerance range, and meanwhile, the locking screw and the pressing block have enough locking force on the cutter bar so as to prevent the position of the cutter from changing in the cutting process.
When the traditional assembled cutter is assembled, after the locking screw is required to be withdrawn to a sufficient gap, the cutter bar type blade can be placed in the cutter groove of the cutter bar type cutter, then the locking screw is rotated to enter a pre-tightening state, and the cutter bar is adjusted to the required precision and then locked
In order to facilitate the precision adjustment of the knife bar type knife blade during the knife tool assembly, proper pretightening force is applied by a locking screw, a pressing block and a spring before the knife bar is completely locked, so that the knife bar type knife blade is prevented from sliding. Thus, the knife bar assembly knife tool can be generally broken down into three states, namely a free state, a pre-tensioned state (or an adjusted state) and a locked state (or a completed state) during assembly or disassembly. When in a free state, the blade can freely move along the direction of the cutter groove guide line and the radial direction in the cutter groove, the blade in the pre-tightening state is kept still under the action of no external force in the cutter groove, the blade can move up and down along the direction of the cutter groove guide line under the action of the action force along the direction of the cutter groove guide line to adjust the position, and after the blade is adjusted to a required position, the locking screw is rotated to push the pressing block to press the blade, namely, the blade enters a locking state.
The double-screw knife bar clamping structure disclosed in CN 204470996U comprises the following components: cutter head main part, pretension screw, locking screw, outer loop briquetting, open the sword groove that has the blade in the cutter head main part, open the screw hole that has two assembly screws in the position of corresponding every sword groove on the outer loop, the briquetting passes through the draw-in groove and links to each other with the locking screw, another side that is opposite with the draw-in groove on the briquetting presses on the sword strip of inserting the sword inslot, the spring is installed to pretension screw thread bottom, the spring other end extrusion is on the briquetting, before locking screw locking, pretension screw accessible bottom the spring give a pretightning force for the briquetting earlier, just so avoided the removal of sword strip when locking screw locking.
However, when the clamping structure is operated, because the contact area of the cutter bar and the pressing block is too large, when the cutter bar moves up and down, a large friction force is generated between the cutter bar and the pressing block, so that the cutter bar is not continuous and smooth enough to be inserted into and withdrawn from the cutter slot, and moreover, the movement of the cutter bar during the up and down movement is too harsh, so that the adjustment difficulty of the cutter bar is increased.
In this regard, CN 205851997U discloses a structure for single screw pretensioning and clamping of milling cutter bars, the composition of which comprises: the milling cutter disc comprises a milling cutter disc main body, milling cutter bars, pre-tightening steel balls, a pressing block, locking screws and an outer ring, wherein the pre-tightening steel balls can provide a pre-tightening force for the cutter bars when the milling cutter disc main body, the milling cutter bars, the pre-tightening steel balls, the pressing block, the locking screws and the outer ring are assembled, so that the cutter bars can be simply fixed in the cutter adjusting process.
However, the structure of the pre-tightening and clamping milling cutter bar has more parts, at least three parts including a spring, a steel ball and a retainer ring are needed, if the number of the milling cutter bar is 24, 24 springs, 24 steel balls and 24 retainer rings are needed in total, and compared with a traditional cutter, 72 scattered parts are more inconvenient to assemble, and in addition, because the spring holes need to have a certain depth, in order to avoid locking screws, the cutter bar in a pre-tightening state can be stressed unevenly up and down only in an upper position on a pressing block, and an ideal pre-tightening effect is difficult to achieve.
Disclosure of Invention
The object of the present invention is to provide a cutting tool with a pretensioned spring. The cutting tool can realize that the blade can enter the pre-tightening state after being inserted into the cutter groove during tool assembly, the blade can be continuously and smoothly inserted into and withdrawn from the cutter groove, the adjustment is easy, in addition, parts are fewer, and the cutter bar can be ensured to be in a reasonable stress state under the pre-tightening state.
Another object of the present invention is to provide an assembly method for assembling the cutting tool with a pretension spring.
In order to achieve the above object, the present invention provides a cutting tool with a pretension spring, including a tool body, the tool body is provided with a tool slot for accommodating a blade, at least one threaded through hole is provided between an outer edge of the tool body and an outer wall of each tool slot, a locking screw is provided in the threaded through hole, a pressing block is provided between the locking screw and the blade and positions the blade through the pressing block, a spring slot is provided on an inner side surface of the pressing block, which contacts with a pressed surface of the blade, a pretension spring is provided in the spring slot, the pretension spring has a pressing part contacting with the pressed surface of the blade in a smooth transition manner in both insertion and withdrawal directions, in a free state, the pressing part of the pretension spring is higher than the inner side surface of the pressing block, and has a gap with the pressed surface of the blade, in a pretension state, the pressing part of the pretension spring is higher than the inner side surface of the pressing block after being deformed by pressing, and contacts with the pressed surface of the blade, and in a locked state, the pretension spring is completely accommodated in the pressed surface of the pressing block, which contacts with the pressed surface of the pressing block.
Preferably, a threaded through hole is formed between the outer edge of the cutter body and the outer wall of each cutter groove, and the pressing part of the pre-tightening spring is transversely aligned with the locking screw.
Preferably, two threaded through holes are formed between the outer edge of the cutter body and the outer wall of each cutter groove, an upper locking screw and a lower locking screw are respectively arranged in each threaded through hole, and the pressing part of the pre-tightening spring is approximately positioned in the middle of the upper locking screw and the lower locking screw in the vertical direction.
Preferably, one end of the pre-tightening spring is fixedly connected with the pressing block in the spring groove.
Preferably, two ends of the pre-tightening spring are fixedly connected with the pressing block in the spring groove.
Preferably, a clamping part is arranged in the spring groove, and two ends of the pre-tightening spring are clamped at the clamping part of the spring groove.
Preferably, the clamping parts are clamping grooves formed at the upper end and the lower end of the spring groove, clamping joints are formed at the two ends of the pre-tightening spring, and the clamping joints are clamped in the clamping grooves by means of rebound after the two ends of the pre-tightening spring are deformed towards the middle.
Preferably, the pre-tightening spring is a bow spring, a wave spring, a leaf spring or a wire spring, and a part which is laterally protruded relative to the inner side surface of the pressing block forms a pressing part for contacting with the pressed surface of the blade.
To achieve the above another object, the present invention provides a method of assembling a cutting tool having a pretensioning spring, for assembling the cutting tool according to any one of the above, comprising:
rotating at least one locking screw through first torque to inwards push the pressing block to advance, and driving the pre-tightening spring to be in surface contact with the pressed surface of the blade by the pressing block;
before the blade moves forward to the state that the inner side surface of the pressing block is contacted with the pressed surface of the blade, the compression amount of the pre-tightening spring is adjusted, so that the pre-tightening force generated by the pre-tightening spring can prevent the blade from sliding along the direction of the guiding line of the blade groove under the action of no external force, and meanwhile, the position of the blade can be adjusted up and down under the action of the action force along the direction of the guiding line of the blade groove;
after the pressing block advances to the inner side surface to be in contact with the pressed surface of the cutter bar, the locking screw is rotated through second torque, and the locking force of the pressing block and the pre-tightening spring on the cutter blade is adjusted.
Further, at least one of the locking screws is back-rotated outwardly by a third torque to adjust the locking force, pretension, or release the blade, the third torque being greater than the second torque.
The cutting tool provided by the invention can be used for pre-tightening the blade through the pressing block with the pre-tightening spring and the locking screw, so that the blade can be inserted into the cutter groove to enter a pre-tightening state when the cutting tool is assembled, single-hand operation can be completed, the cutter loading efficiency can be improved, the pre-tightening force can be controlled by adjusting the deformation of the pre-tightening spring, the position of the blade can be conveniently adjusted, and the pressing part of the pre-tightening spring is contacted with the blade in a tangential mode, so that the blade can be continuously and smoothly inserted into and withdrawn from the cutter groove, and the cutter is easy to adjust. In addition, the pressing part is formed by the self structure of the pre-tightening spring, other parts do not need to be additionally arranged, the structure is simple, the assembly is easy, the depth of the spring groove is shallower compared with that of the spring hole, and the spring groove can be arranged at an ideal position, so that the cutter bar can be ensured to be in a more reasonable stress state under the pre-tightening state.
The assembly method provided by the invention is used for assembling the cutting tool with the pre-tightening spring, and the assembly method for assembling the cutting tool has corresponding technical effects because the cutting tool has the technical effects.
Drawings
FIG. 1 is a cross-sectional view of a cutting tool with a pretensioned spring in a free state as disclosed in an embodiment of the present invention;
FIG. 2 is an isometric view of the compact of FIG. 1 provided with a bow spring;
FIG. 3 is a cross-sectional view of a cutting tool with a pretension spring in a pretension state according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a cutting tool with a pretensioned spring in a locked state according to an embodiment of the present invention;
fig. 5 is a cross-sectional view showing a cutting tool having a pretensioning spring according to an embodiment of the present invention, when the cutting tool is assembled, the cutting insert is inserted into the pocket to reach the pretensioned state.
In the figure:
1. the cutter body 2, the blade 3, the pressing block 5, the cutter groove 6, the upper locking screw 7, the lower locking screw 8, the spring groove 81, the clamping groove 9, the bow spring 91 and the clamping connector
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
In this context, the terms "up, down, left, right" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may also change according to the differences of the drawings, and the text of the specification has a direction-defining portion, and preferably adopts a text-defining direction, so that it is not to be interpreted as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1 and 2, fig. 1 is a cross-sectional view of a cutting tool with a pretensioned spring according to an embodiment of the present invention in a free state; fig. 2 is an axial side view of the press block of fig. 1 provided with a bow spring.
As shown in the figure, in a specific embodiment, the cutting tool with the pre-tightening spring provided by the invention mainly comprises a tool body 1, a plurality of blades 2, a pressing block 3, locking screws and the like, wherein the tool body 1 is disc-shaped, a cutter groove 5 which is penetrated up and down and distributed in a ring shape is arranged on the tool body to accommodate and fix the blades 2, two threaded through holes are respectively formed between the outer edge of the tool body 1 and the outer wall of each cutter groove 5, an upper locking screw 6 and a lower locking screw 7 are arranged in the threaded through holes, a pressing block 3 is arranged between the upper locking screw 6 and the lower locking screw 7 and the blades 2, and the blades 2 are positioned through the pressing block 3.
In order to enable the blade 2 to be in a pre-tightening state in the assembly process, a generally rectangular spring groove 8 is formed in the inner side surface, which is in contact with the pressed surface of the blade 2, of the pressing block 3, a bow spring 9 is arranged in the spring groove 8, clamping grooves 81 are respectively formed at the upper end and the lower end of the spring groove 8, clamping joints 91 are formed after the two ends of the bow spring 9 are bent, the clamping joints 91 are clamped in the clamping grooves 81 by means of rebound after the two ends of the bow spring 9 are deformed towards the middle, a pressing part which is used for being in contact with the pressed surface of the blade 2 is formed at a part which is laterally protruded relative to the inner side surface of the pressing block 3, and the pressing part of the bow spring 9 is generally positioned at the middle position of the upper locking screw 6 and the lower locking screw 7 in the vertical direction.
The lateral protruding part of the bow spring 9 is arc-shaped, so that the bow spring 9 is in tangential contact with the pressed surface of the blade 2 in the inserting and withdrawing directions, in a free state, the pressing part of the bow spring 9 is higher than the inner side surface of the pressing block 3 and is in clearance with the pressed surface of the blade 2, in a pre-tightening state, the pressing part of the bow spring 9 is still higher than the inner side surface of the pressing block 3 after being pressed and deformed and is in contact with the pressed surface of the blade 2, and in a locking state, the bow spring 9 can be completely accommodated in a space formed by the pressed surface of the blade 2 and the spring groove 8 of the pressing block 3 after being pressed and deformed, and at the moment, the inner side surface of the pressing block 3 is in contact with the pressed surface of the blade 2.
Of course, in other embodiments, only one threaded through hole may be formed between the outer edge of the cutter body 1 and the outer wall of each cutter slot 5, and in the case of only one locking screw, the pressing portion of the bow spring 9 may be laterally aligned with the locking screw.
The working mechanism of the cutting tool in different states is described in more detail below.
Referring to fig. 3 and 4 together, fig. 3 is a cross-sectional view of a cutting tool with a pretensioning spring according to an embodiment of the present invention in a pretensioned state; fig. 4 is a cross-sectional view of a cutting tool with a pretensioned spring in a locked state according to an embodiment of the present invention.
As shown in the figure, in the free state, the height of the bow spring 9 is H0, the height of the bow spring 9 higher than the surface of the pressing block 3 is dH0, the distance between the bow spring 9 and the blade bar 2 is G, the gap distance between the mating surfaces of the blade bar 2 and the pressing block 3 is C1, and the blade bar 2 can freely move in the direction of the guiding line of the blade groove 5 and in the radial direction in the blade groove 5.
The upper locking screw 6 is rotated to inwards advance to push the pressing block 3, the pressing block 3 drives the bow-shaped spring 9 to gradually approach the blade 2, the bow-shaped spring 9 and the blade 2 are contacted with each other when the distance between the bow-shaped spring 9 and the blade 2 is G=0, and then the bow-shaped spring 9 is compressed to generate a pretightening force by continuing to rotate the upper locking screw 6 to inwards advance, so that the pretightening force is brought into a pretightening state.
The height of the bow spring 9 after being pressed and deformed is H2, the deformation amount is H0-H2, and the magnitude of the pretightening force is given by the assumption that the elasticity coefficient of the bow spring 9 is K
F＝K(H0-H2) (EQ-1)
The clearance distance between the matching surfaces of the blade 2 and the pressing block 3 is C2, and the following is established by combining with FIG. 1
H0-H2＝dH0-C 2 (EQ-2)
Namely: the deformation H0-H2 of the bow spring 9 can be adjusted by changing C2, so that the pretightening force F is changed. C2 can be adjusted by turning the upper locking screw 6 to a value between 0 and dH0, and the bow spring 9 is deformed to provide a preload force F between 0 and K dH 0.
According to the statics principle, assuming that the friction coefficient between the blade 2 and the bow spring 9 and the inner side of the pocket 5 is μ, the frictional resistance provided by the preload force F is
f＝μF (EQ-3)
When the frictional resistance f is greater than the component force in the direction of the movement tendency of the blade 2 due to gravity, the blade 2 in the pretensioned state is held stationary in the pocket 5 without the action of external force, and at the same time, the blade 2 is movable in the direction of the guide line of the pocket 5 under the action of the force in the direction of the guide line of the pocket 5 to adjust the position.
Obviously, there is a critical state of movement and immobility of the blade 2 in the pocket 5 without external force, i.e. the blade 2 cannot remain stationary in the pocket 5 once the pretension F is smaller than the minimum pretension Fmin.
According to the formula (EQ-1) and the formula (EQ-2)
K(H0-H2)＝K(dH0-C 2)≥Fmin (EQ-4)
This is the pretensioning condition of the blade 2, as well as the design condition of the bow spring 9 and the entire pretensioning device, the minimum pretensioning force Fmin being determinable by test.
In the pre-tightening state, the blade 2 is adjusted to a required position, and when the upper locking screw 6 is rotated to push the pressing block 3 to be contacted with the corresponding side surface of the blade 2 (namely, C2=0), the locking state is about to be entered.
After the upper locking screw 6 is rotated to push the pressing block 3 to be contacted with the corresponding side surface of the blade 2, the upper locking screw locking 6 is rotated with larger torque, then the lower locking screw 7 is rotated with larger torque to lock after the lower locking screw 7 is easily rotated to be contacted with the pressing block 3, and the upper locking screw and the lower locking screw are alternately rotated to lock the blade 2 with larger torque. The blade locking force is ultimately determined by the locking torque of the upper locking screw 6 and the lower locking screw 7.
The blade locking force needs to be enough and firm to lock the screw in a sharpening cycle of the blade 2, wherein the sharpening cycle refers to the number of gear workpieces which are qualified in cutting processing of an assembled cutter after the blade 2 is sharpened once. The cutting edge of the blade 2 is sharpened after the cutter cuts and processes a certain number of gear workpieces, so that the geometric dimension is out of tolerance, the cutting edge becomes blunt and no longer sharp, and the blade 2 needs to be sharpened again after being disassembled.
When the blade 2 is disassembled, the lower locking screw 7 is reversely rotated to separate the blade 2 from the pressing block, then the upper locking screw 6 is reversely rotated to separate the pressing block 3 from the blade 2 under the reaction of the bow spring 9, the bow spring 9 still contacts the blade 2 to enter a pre-tightening state, and if the blade pre-tightening condition is met, the blade 2 is kept still in the cutter slot 5 under the action of no external force, but can be pulled out along the direction of the guide line of the cutter slot 5.
With continued reference to fig. 5, fig. 5 is a cross-sectional view of a cutting tool with a pretensioning spring according to an embodiment of the present invention, when assembled, the blade is inserted into the pocket to reach the pretensioned state.
As shown in the figure, the clearance distance between the matching surfaces of the blade 2 and the pressing block 3 is C0, the blade 2 is wedged into the compression bow spring 9, the deformation of the bow spring 9 is dH1, dH2=dH2 0-C0, and if the blade pre-tightening condition is met, namely K is dH2 1 not less than Fmin, the blade 2 is inserted into the cutter groove 5 to compress the bow spring 9, and then the pre-tightening state can be achieved.
Therefore, if the blade 2 is drawn out under the condition of satisfying the blade pre-tightening condition when the blade 2 is disassembled, the resharpened blade 2 is assembled again under the condition that the upper locking screw and the lower locking screw are not rotated, the blade 2 can enter the pre-tightening state after being inserted into the blade groove 5 to compress the bow-shaped spring 9, and the operation can be completed by only one hand.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of these, specific adjustments may be made according to actual needs, thereby obtaining different embodiments. For example, instead of bow springs 9, wave springs, single leaf springs, two leaf springs or wire springs may be used as pretension springs, and if leaf springs are used, the leaf springs may be fixedly connected or snapped at one end to a press block in a spring pocket, etc. This is not illustrated here, as there are many possible implementations.
The blade 2 is pre-tightened by the pressing block 3 with the pre-tightening spring and the locking screw, so that the blade 2 can be inserted into the blade groove 5 to enter a pre-tightening state when the cutter is assembled, single-hand operation can be completed, the cutter loading efficiency can be improved, the pre-tightening force can be controlled by adjusting the deformation of the pre-tightening spring, the position of the blade 2 can be conveniently adjusted, the blade locking force in the locking state is finally determined by the locking torque of the locking screw, and the blade 2 can be continuously and smoothly inserted into and withdrawn from the blade groove 5 due to the contact between the pressing part of the pre-tightening spring and the blade 2 in a tangential mode, so that the cutter loading efficiency is easy to adjust.
In addition, the pressing part is formed by the self structure of the pre-tightening spring, other parts such as a steel ball and a check ring are not required to be additionally arranged, the structure is simple, the assembly is easy, the depth of the spring groove 8 is relatively shallow compared with that of the spring hole, and the spring groove can be arranged at an ideal position, so that the cutter bar 2 can be ensured to be in a more reasonable stress state under the pre-tightening state.
In addition to the cutting tool having a pretension spring described above, the present invention also provides an assembling method for assembling the cutting tool described above, comprising:
the upper locking screw 6 is rotated by a first torque to push the pressing block 3 inwards to advance, and the pressing block 3 drives the bow spring 9 to be in surface contact with the pressed surface of the blade 2.
Before the inner side surface of the pressing block 3 is contacted with the pressed surface of the cutter bar 2, the compression amount of the bow spring 9 is adjusted, so that the generated pretightening force can prevent the cutter blade 2 from sliding along the direction of the guide line of the cutter slot 5 under the action of no external force, and the position of the cutter blade 2 can be adjusted up and down under the action of the acting force along the direction of the guide line of the cutter slot.
After the pressing block 3 advances to the inner side surface to be in contact with the pressed surface of the cutter bar 2, the upper locking screw 6 is rotated by the second torque, and the locking force of the pressing block 3 and the bow spring 9 on the cutter blade 2 is regulated.
When the locking force, the pretightening force, or the blade 2 is adjusted, the lower locking screw 7 is reversely rotated by a third torque to withdraw it outwards, the third torque is larger than the second torque, and then the upper locking screw 6 is reversely rotated to withdraw.
The cutting tool with the pretension spring and the method of assembling the same provided by the present invention are described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. The cutting tool with the pre-tightening springs comprises a tool body, wherein a tool groove for accommodating the blades is arranged in the tool body, at least one threaded through hole is formed between the outer edge of the tool body and the outer wall of each tool groove, a locking screw is arranged in each threaded through hole, a pressing block is arranged between each locking screw and each blade and used for positioning the blade, and the cutting tool is characterized in that a spring groove is formed in the inner side surface of each pressing block, which is contacted with the pressed surface of each blade, of each pressing block, the pre-tightening springs are internally provided with the pre-tightening springs, each pre-tightening spring is provided with a pressing part which is contacted with the pressed surface of each blade in a smooth transition manner in the inserting and withdrawing directions, in a free state, the pressing parts of the pre-tightening springs are higher than the inner side surface of each pressing block, a gap is formed between the pressing parts of the pre-tightening springs and the pressed surface of each blade, after the pre-tightening springs are pressed and deformed, the pressing parts of the pre-tightening springs are higher than the inner side surface of each pressing block and are contacted with the pressed surface of each blade, and in the locking state, the pre-tightening springs are completely accommodated in the pressing blocks after the pressing surfaces are pressed surface of each pressing block; the pre-tightening spring is a bow spring, a wave spring, a leaf spring or a steel wire spring, and a pressing part for contacting with the pressed surface of the blade is formed at a part which is laterally protruded relative to the inner side surface of the pressing block.
2. The cutting tool with the pre-tightening spring according to claim 1, wherein a threaded through hole is formed between the outer edge of the tool body and the outer wall of each tool slot, and the pressing part of the pre-tightening spring is transversely aligned with the locking screw.
3. The cutting tool with the pre-tightening spring according to claim 1, wherein two threaded through holes are formed between the outer edge of the tool body and the outer wall of each tool slot, an upper locking screw and a lower locking screw are respectively arranged in each threaded through hole, and the pressing part of the pre-tightening spring is positioned at the middle position of the upper locking screw and the lower locking screw in the vertical direction.
4. The cutting tool with a pretension spring according to claim 1, wherein one end of the pretension spring is fixedly connected with the press block in the spring groove.
5. The cutting tool with a pretension spring according to claim 1, wherein both ends of the pretension spring are fixedly connected with the pressing block in the spring groove.
6. The cutting tool with the pre-tightening spring according to claim 1, wherein a clamping part is arranged in the spring groove, and two ends of the pre-tightening spring are clamped at the clamping part of the spring groove.
7. The cutting tool with a pretension spring according to claim 6, wherein the engagement portions are engagement grooves formed at upper and lower ends of the spring groove, and engagement joints are formed at both ends of the pretension spring, the engagement joints being engaged with the engagement grooves by rebound after the both ends of the pretension spring are deformed toward the middle.
8. A method of assembling a cutting tool having a pre-tensioned spring for assembling the cutting tool of any one of claims 1 to 7, comprising:
at least one locking screw is rotated through first torque to inwards push the pressing block to advance, and the pressing block drives the pressing part of the pre-tightening spring to be in surface contact with the pressed surface of the blade;
before the blade moves forward to the state that the inner side surface of the pressing block is contacted with the pressed surface of the blade, the compression amount of the pre-tightening spring is adjusted, so that the pre-tightening force generated by the pre-tightening spring can prevent the blade from sliding along the direction of the guiding line of the cutter slot under the action of no external force, and meanwhile, the position of the blade can be adjusted up and down under the action of the action force along the direction of the guiding line of the cutter slot;
after the pressing block advances to the inner side surface to be in contact with the pressed surface of the blade, the locking screw is rotated through second torque, and the locking force of the pressing block and the pre-tightening spring on the blade is adjusted.
9. The method of assembling a cutting tool having a pretension spring according to claim 8, wherein at least one of the locking screws is back-rotated outwardly by a third torque to adjust the locking force, pretension, or release the blade, the third torque being greater than the second torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114888319A (en) * | 2022-06-08 | 2022-08-12 | 哈尔滨理工大学 | Novel cutter head for machining spiral bevel gear and cutter strip installation and adjustment method |
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| CN112958851A (en) | 2021-06-15 |
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